Better Sleep Cycle Vitamin B12 deficiency is linked to fatigue, and some patients also deal with disturbed sleep cycles
Side effects to Vitamin B12 are SO rare that they cannot be estimated from current data (in other words, less than 1 in 10'000)
It can be provided either with an IV drip or through an intramuscular injection

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In many cases, reducing or stopping the supplement may lead to gradual improvement
In rare cases, a long-standing B12 deficiency can affect the optic nerve, potentially causing blurred or double vision